Safety fence and vehicle testing device

ABSTRACT

A safety fence for a vehicle testing device includes a fixed fence part, a slide fence part, a first angled fence part, and a second angled fence part. The fixed fence part is structured to be arranged substantially in parallel with a wheel of a test vehicle, wherein the test vehicle is placed on a roller exposed through a roller opening of a pit cover. The slide fence part is arranged in parallel with the fixed fence part, and structured to move in a longitudinal direction of the test vehicle. The first angled fence part is attached to an end portion of the fixed fence part, and structured to swing inwardly and outwardly of the fixed fence part. The second angled fence part is attached to an end portion of the slide fence part, and structured to swing inwardly and outwardly of the slide fence part.

TECHNICAL FIELD

The present invention relates to a safety fence for a vehicle testingdevice such as a chassis dynamometer for mounting a vehicle via rollers,and testing fuel efficiency, exhaust gas and others, and relates to avehicle testing device including the safety fence.

BACKGROUND ART

A vehicle testing device is provided with a safety fence for preventingthe occurrence of an accident where a person accidentally contacts adriving wheel when the driving wheel is rotating at high speed duringvehicle testing operation (see patent documents 1 and 2).

Patent document 1 discloses a safety fence that is attached to a pitcover, and includes an angled fence that can be angled for preventinginterference with an opening and closing door of a test vehicle, whereinthe safety fence serves to prevent a person from entering a spacebetween the safety fence and the test vehicle.

Patent document 2 discloses a safety fence that includes a verticalframe rod and a safety fence body mounted to the vertical frame rod,wherein the vertical frame rod is structured to slide on a slide railprovided in a vehicle testing device.

PRIOR ART DOCUMENT(S) Patent Document(s)

Patent Document 1: Japanese Patent Application Publication No.2010-169485

Patent Document 2: Japanese Utility Model Application Publication No.H5-11044

SUMMARY OF INVENTION

However, the safety fence according to patent document 1 includes alarge fixed fence even with the angled fence held angled, so that if thevehicle and a test facility are compact, the safety fence may interferewith the vehicle door when the vehicle door is opened and closed, andthereby prevent the vehicle door from being fully opened.

On the other hand, the safety fence according to patent document 2includes a structure in which the safety fence body is opened byrotation around the vertical frame rod. Accordingly, no auxiliary device(such as a driver aid) can be arranged in a space required to allowoperation (opening and closing) of the safety fence.

The present invention has been made in view of the problems describedabove, and is targeted for providing a safety fence and a vehicletesting device including the same in which interference with a door of atest vehicle can be prevented regardless of the size of the testvehicle, without limiting the flexibility of layout of an auxiliarydevice provided for the vehicle testing device.

In view of the foregoing, according to an embodiment of the presentinvention, a safety fence for a vehicle testing device, includes: afixed fence part structured to be arranged substantially in parallelwith a wheel of a test vehicle, wherein the test vehicle is placed on aroller exposed through a roller opening of a pit cover; a slide fencepart arranged in parallel with the fixed fence part, and structured tomove in a longitudinal direction of the test vehicle; a first angledfence part attached to an end portion of the fixed fence part, andstructured to swing inwardly and outwardly of the fixed fence part; anda second angled fence part attached to an end portion of the slide fencepart, and structured to swing inwardly and outwardly of the slide fencepart.

According to an embodiment of the present invention, the safety fenceincludes a part structured to be attached to the pit cover or a rollercover, wherein the safety fence extends along a peripheral edge of theroller opening.

According to an embodiment of the present invention, the safety fenceincludes: a fixed fence part support structured to support the fixedfence part; and a fixing tool structured to fix the fixed fence partsupport to the pit cover or the roller cover.

According to an embodiment of the present invention, the safety fence isstructured such that the fixed fence part is structured to be arrangedsubstantially horizontally so as to correspond in position to the rolleropening, and cover the roller opening.

According to an embodiment of the present invention, the safety fence isstructured such that the first angled fence part and the second angledfence part are structured to allow the fixed fence part to be supportedby the pit cover when the fixed fence part is arranged substantiallyhorizontally.

According to an embodiment of the present invention, the safety fence isstructured such that: the first angled fence part is structured to befixed at a first arbitrary position in a range of 270 degrees from aposition parallel with the fixed fence part; and the second angled fencepart is structured to be fixed at a second arbitrary position in a rangeof 270 degrees from a position parallel with the slide fence part.

According to an embodiment of the present invention, the safety fencefurther includes: a first hand knob structured to fix the first angledfence part to the first arbitrary position; and a second hand knobstructured to fix the second angled fence part to the second arbitraryposition.

According to an embodiment of the present invention, the safety fencefurther includes a pair of slide rails disposed between the fixed fencepart and the slide fence part, and structured to guide the slide fencepart in the longitudinal direction.

According to an embodiment of the present invention, the safety fencefurther includes a third hand knob structured to fix the slide fencepart to the fixed fence part.

According to an embodiment of the present invention, a safety fence fora vehicle testing device, includes: a fixed fence part structured to bearranged substantially in parallel with a wheel of a test vehicle,wherein the test vehicle is placed on a roller exposed through a rolleropening of a pit cover; a first slide fence part arranged in parallelwith the fixed fence part, and structured to move in a longitudinaldirection of the test vehicle; a second slide fence part structured tobe arranged in parallel with the fixed fence part, and move in avertical direction of the test vehicle; a first angled fence partattached to an end portion of the fixed fence part, and structured toswing inwardly and outwardly of the fixed fence part; and a secondangled fence part attached to an end portion of the first slide fencepart, and structured to swing inwardly and outwardly of the first slidefence part.

According to an embodiment of the present invention, a safety fence fora vehicle testing device, includes: a fixed fence part structured to bearranged substantially in parallel with a wheel of a test vehicle,wherein the test vehicle is placed on a roller exposed through a rolleropening of a pit cover; a first slide fence part arranged in parallelwith the fixed fence part, and structured to move in a longitudinaldirection of the test vehicle; a third slide fence part structured to bearranged in parallel with the first slide fence part, and move in avertical direction of the test vehicle; a first angled fence partattached to an end portion of the fixed fence part, and structured toswing inwardly and outwardly of the fixed fence part; and a secondangled fence part attached to an end portion of the first slide fencepart, and structured to swing inwardly and outwardly of the first slidefence part.

According to an embodiment of the present invention, a safety fence fora vehicle testing device, includes: a fixed fence part structured to bearranged substantially in parallel with a wheel of a test vehicle,wherein the test vehicle is placed on a roller exposed through a rolleropening of a pit cover; a first slide fence part arranged in parallelwith the fixed fence part, and structured to move in a longitudinaldirection of the test vehicle; a second slide fence part structured tobe arranged in parallel with the fixed fence part, and move in avertical direction of the test vehicle; a third slide fence partstructured to be arranged in parallel with the first slide fence part,and move in the vertical direction; a first angled fence part attachedto an end portion of the fixed fence part, and structured to swinginwardly and outwardly of the fixed fence part; and a second angledfence part attached to an end portion of the first slide fence part, andstructured to swing inwardly and outwardly of the first slide fencepart.

According to an embodiment of the present invention, a vehicle testingdevice includes the safety fence.

According to the present invention, the safety fence and the vehicletesting device including the same can be prevented from interfering witha door of a test vehicle regardless of the size of the test vehicle,without limitation to the flexibility of layout of an auxiliary deviceprovided for the vehicle testing device.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 shows (a) a schematic view of a safety fence provided for avehicle testing device according to an embodiment of the presentinvention, (b) an explanatory view of the safety fence when in a closedstate, and (c) an explanatory view of the safety fence when in an openedstate.

FIG. 2 shows (a) a schematic plan view of the safety fence according tothe first embodiment of the present invention, (b) a front view of thesafety fence, (c) a plan view showing an example of arrangement of thesafety fences, and (d) a side view of the safety fence.

FIG. 3 shows (a) a schematic plan view of a safety fence according to asecond embodiment of the present invention, (b) a front view of thesafety fence, (c) a plan view showing an example of arrangement of thesafety fences, and (d) a side view of the safety fence from a positionfacing an end of a fixed fence of the safety fence.

FIG. 4 shows (a) a schematic configuration view of a clamp lever forfixing a safety fence, (b) an explanatory view of the clamp lever whenthe safety fence is fixed by the clamp lever, and (c) an explanatoryview of the clamp lever when a long screw of the clamp lever is screwedin a nut via an insertion pipe and a washer, wherein the nut is built ina pit.

FIG. 5 shows a plan view of the safety fence provided with a first handknob, a second hand knob, and a third hand knob.

FIG. 6 shows (a) a front view of a roller-side angling part provided inthe safety fence according to the second embodiment, and (b) a side viewof the roller-side angling part.

FIG. 7 shows (a) a schematic view of a safety fence for a vehicletesting device according to a third embodiment of the present invention,(b) an explanatory view of the safety fence when in a closed state, and(c) an explanatory view of the safety fence when in an opened state.

FIG. 8 shows (a) a schematic view of a first example of a safety fencefor a vehicle testing device according to a fourth embodiment of thepresent invention, and (b) an explanatory view illustrating operation ofthe safety fence.

FIG. 9 shows (a) a front view of a second example of a safety fenceaccording to a fourth embodiment of the present invention, (b) a planview of the safety fence, (c) a side view of the safety fence from aposition facing its first end side, (d) a side view of the safety fencein a folded state from a position facing its second end side, (e) a sideview of the safety fence in an unfolded state from the position facingits second end side, and (f) a rear view of a lower part of the safetyfence.

FIG. 10 is a top view illustrating a condition that a test vehicle isrestrained in the vehicle testing device.

MODE(S) FOR CARRYING OUT INVENTION

The following describes embodiments of the present invention withreference to the drawings.

First Embodiment

FIGS. 1 and 2 show a vehicle testing device 1 according to a firstembodiment of the present invention, which includes: a pit cover 4including roller openings 40 through each of which a roller 3 isexposed, wherein a wheel 20 of a test vehicle 2 is mounted on the roller3; and safety fences 5 arranged outside the test vehicle 2 andsubstantially in parallel with the wheels (front wheels 20F and rearwheels 20R).

As shown in FIG. 2 (c), each safety fence 5 is attached to the pit cover4 along a peripheral edge of one of the roller openings 40 correspondingto each wheel 20 of the test vehicle 2 shown in FIG. 1.

<Example of Safety Fence 5>

As shown in FIG. 2 (b), the safety fence 5 includes a fixed fence part51, a slide fence part 52, a first angled fence part 53, and a secondangled fence part 54.

The fixed fence part 51 is arranged substantially in parallel with thewheels 20 of the test vehicle 2.

The fixed fence part 51 includes: a frame 511 implemented by an aluminumframe; a welded wire netting 512 mounted to the frame 511; and a fixedfence support 513 implemented by an aluminum frame, and structured tosupport the frame 511 upright. The fixed fence part 51 further includes:a third hand knob 514 employed to press and fix the slide fence part 52to the frame 511; and a handle 516 employed to carry the safety fence 5.

As shown in FIG. 2 (a), the fixed fence part 51 includes a first angleadjustment plate 57 a structured to define a range of rotation of thefirst angled fence part 53. As shown in FIG. 5, the first angleadjustment plate 57 a is formed with an arc-shaped slot 571 a throughwhich a rotation shaft of a first hand knob 58 a is inserted for fixingthe first angled fence part 53 to the first angle adjustment plate 57 a,wherein the slot 571 a defines a range of rotation of the first angledfence part 53 from a position in parallel with the fixed fence part 51to a position at 270 degrees in a horizontal direction.

The slide fence part 52 is arranged inside the fixed fence part 51 andin parallel with the fixed fence part 51, and structured to move in alongitudinal direction of the test vehicle 2, facing the test vehicle 2.

Specifically, when the safety fence 5 is disposed substantially inparallel with the front wheel 20F of the test vehicle 2, the slide fencepart 52 is placed to move toward a central part of the test vehicle 2 ina range from a position closer to a front end part of the front wheel20F to a position closer to a rear end part of the front wheel 20F asshown in FIG. 1 (a).

On the other hand, when the safety fence 5 is disposed substantially inparallel with the rear wheel 20R of the test vehicle 2, the slide fencepart 52 is placed to move toward the central part of the test vehicle 2in a range from a position closer to a rear end part of the rear wheel20R to a position closer to a front end part of the rear wheel 20R asshown in FIG. 1 (a)-(c).

As shown in FIG. 2 (b), similar to the fixed fence part 51, the slidefence part 52 includes: a frame 521 implemented by an aluminum frame;and a welded wire netting 522 mounted to the frame 521.

As shown in FIG. 2 (a), the slide fence part 52 includes a second angleadjustment plate 57 b structured to define a range of rotation of thesecond angled fence part 54. As shown in FIG. 5, the second angleadjustment plate 57 b is also formed with an arc-shaped slot 571 bthrough which a rotation shaft of a second hand knob 58 b is insertedfor fixing the second angled fence part 54 to the second angleadjustment plate 57 b, wherein the slot 571 b defines a range ofrotation of the second angled fence part 54 from a position in parallelwith the slide fence part 52 to a position at 270 degrees in thehorizontal direction.

As shown in FIG. 4 (b), a pair of slide rails 55 and a pair of stoppers59 are provided between the fixed fence part 51 and the slide fence part52, wherein the slide rails 55 are structured to guide the slide fencepart 52 in the longitudinal direction from the position in parallel withthe fixed fence part 51, and wherein the stoppers 59 are structured torestrict this guidance.

As shown in FIG. 2 (a) (b), the first angled fence part 53 is attachedto an end portion of the fixed fence part 51 by a hinge part 56, andstructured to swing inwardly and outwardly of the fixed fence part 51.The first angled fence part 53 includes a frame 531 implemented by analuminum frame. As well as the fixed fence part 51 and the slide fencepart 52, a welded wire netting not shown is mounted to the frame 531 asappropriate.

The first angled fence part 53 is further structured to be pressed andfixed by the first hand knob 58 a at a first arbitrary position definedby the slot 571 a of the first angle adjustment plate 57 a shown in FIG.5.

As shown in FIG. 2 (b), the second angled fence part 54 is attached toan end portion of the slide fence part 52 by a hinge part 56, andstructured to swing inwardly and outwardly of the slide fence part 52.The second angled fence part 54 includes a frame 541 implemented by analuminum frame. As well as the fixed fence part 51 and the slide fencepart 52, a welded wire netting not shown is mounted to the frame 541 asappropriate.

Similar to the first angled fence part 53, the second angled fence part54 is further structured to be pressed and fixed by the second hand knob58 b at a second arbitrary position defined by the slot 571 b of thesecond angle adjustment plate 57 b shown in FIG. 5.

As shown in FIG. 2, the safety fence 5 is structured to be attached toand detached from the pit cover 4 by a fixing tool 6. Specifically, apedestal 515 of the fixed fence support 513 is fixed to the pit cover 4by the fixing tool 6.

The fixing tool 6 includes a nut 61, an insertion pipe 62, a long screw63, a washer 64, and a clamp lever 65. The nut 61 is arranged and fixedin a pit 41 below the pit cover 4. The insertion pipe 62 is structuredto press the pedestal portion 515 of the fixed fence support 513 to thepit cover 4 by its flange 621 in a state where the insertion pipe 62 isin contact with the fixed nut 61 at an inclined plane. The long screw 63is inserted in the insertion pipe 62, and screwed to the nut 61. Theclamp lever 65 is attached to an upper end of the long screw 63, andstructured to press the flange 621 of the insertion pipe 62 via thewasher 64.

<Example of Use of Safety Fence 5>

The following describes an example of use of the safety fence 5according to the present embodiment with reference to FIGS. 1, 2 and 4.

The test vehicle 2 shown in FIG. 1 is placed on the pit 41. When thewheels 20 of the test vehicle 2 are placed on the rollers 3, the safetyfences 5 may be attached to the pit covers 4 or may be removed from thepit covers 4. When the safety fence 5 is attached thereto, the fixedfence support 513 of the safety fence 5 is fixed to a predeterminedposition on the pit cover 4 by the fixing tool 6 as shown in FIG. 2 (b).First, the insertion pipe 62 is inserted into the pit 41 under acondition that the insertion pipe 62 passes through the pedestal 515 ofthe fixed fence support 513 as shown in FIG. 2, and the lower end of theinsertion pipe 62 shown in FIG. 4 is in contact with the upper end ofthe nut 61 at an inclined plane, wherein the nut 61 is fixed below thepit cover 4. Next, the long screw 63, which is inserted through thewasher 64 and the insertion pipe 62, is screwed to the nut 61 byoperating the clamp lever 65. Simultaneously, the pedestal 515 of thefixed fence support 513 is pressed by the clamp lever 65 via the washer64 and the flange 621 of the insertion pipe 62, and the fixed fencesupport 513 is thereby fixed to the pit cover 4. In particular, theinclined contact between the insertion pipe 62 and the nut 61 serves toprevent the insertion pipe 62 from rotating with the long screw 63during the operation of screwing, and thereby allow the fixed fencesupport 513 to be quickly fixed to the pit cover 4.

As described above, the safety fence 5 is placed and fixed along aperipheral edge of the roller opening 40 of the pit cover 4 as shown inFIG. 2 (c).

In particular, when the safety fence 5 is arranged substantially inparallel with the front wheel 20F of the test vehicle 2, the fixed fencepart 51 is arranged at a position closer to the front end of the frontwheel 20F of the test vehicle 2, while the slide fence part 52 isarranged inside the fixed fence part 51 to be movable in thelongitudinal direction of the test vehicle 2.

On the other hand, when the safety fence 5 is arranged substantially inparallel with the rear wheel 20R of the test vehicle 2, the fixed fencepart 51 is arranged at a position closer to the rear end of the rearwheel 20R, while the slide fence part 52 is arranged inside the fixedfence part 51 to be movable in the longitudinal direction of the testvehicle 2.

Of the test vehicle 2 shown in FIG. 1, a front door 21 may interferewith the second angled fence part 54 of the safety fence 5. When thefront door 21 is to be opened and closed at a driver seat side orpassenger seat side, the second angled fence part 54 is rotated to anarbitrary position outside the slide fence part 52 or to a positionalong the outer surface of the slide fence part 52, and thereafter fixedby the second hand knob 58 b, as shown in FIG. 2 (a) and FIG. 5.Alternatively, the slide fence part 52 is operated to slide to anarbitrary position toward the front side of the test vehicle 2, andthereafter fixed by the third hand knob 514. This serves to preventinterference between the front door 21 and the second angled fence part54 of the safety fence 5.

Similarly, a rear door 22 may interfere with the second angled fencepart 54 of the safety fence 5. When the rear door 22 is to be opened andclosed at the driver seat side or the passenger seat side, the secondangled fence part 54 is rotated to an arbitrary position outside theslide fence part 52 or to a position along the outer surface of theslide fence part 52, and thereafter fixed by the first hand knob 58 a,as shown in FIG. 2 (a) and FIG. 5. Alternatively, the slide fence part52 is operated to slide to an arbitrary position toward the rear side ofthe test vehicle 2, and thereafter fixed by the third hand knob 514, asshown in FIG. 1 (c). This serves to prevent interference between therear door 22 and the second angled fence part 54 of the safety fence 5.

When a test is performed for the test vehicle 2, the first angled fencepart 53 and the second angled fence part 54 of the safety fence 5 arefixed in positions closer to the test vehicle 2 or in positionssubstantially in parallel with the test vehicle 2, thereby preventingentry of a person into a space between the safety fence 5 and the testvehicle 2.

When no person is to enter or leave the test vehicle 2 via the rear door22, the slide fence part 52 of the rear safety fence 5 is operated toslide to an arbitrary position toward the front side of the test vehicle2, and thereafter fixed by the third hand knob 514, as shown in FIG. 1(b).

<Effects of Present Embodiment>

As described above, with the safety fence 5 according to the presentembodiment, when the front door 21 and the rear door 22 of the testvehicle 2 are opened and closed, it is possible to prevent interferencebetween the safety fence 5 and the front door 21 and rear door 22 byoperation of the slide fence part 52, the first angled fence part 53,and the second angled fence part 54. Furthermore, it is possible toreduce the space for operating (opening and closing) the safety fence 5when the front door 21 and the rear door 22 are opened and closed, andthereby enhance the flexibility of layout of auxiliary equipment on thepit 41.

In particular, with regard to the safety fence 5 for the front wheel20F, the fixed fence part 51 is arranged in the position closer to thefront end of the front wheel 20F of the test vehicle 2, andsubstantially in parallel with the front wheel 20F. On the other hand,the slide fence part 52 is movable toward the central part of the testvehicle 2 from the position in parallel with the fixed fence part 51facing the test vehicle 2 as shown in FIG. 1 (a), so that the slidefence part 52 may be arbitrarily arranged in the range from the positioncloser to the front end of the front wheel 20F to the position closer tothe rear end of the front wheel 20F. This serves to flexibly adapt totest vehicles 2 various in size, and further enhance the flexibilitydescribed above.

With regard to the safety fence 5 for the rear wheel 20R, the fixedfence part 51 is arranged in the position closer to the rear end of therear wheel 20R of the test vehicle 2, and substantially in parallel withthe rear wheel 20R. On the other hand, the slide fence part 52 ismovable toward the central part of the test vehicle 2 from the positionin parallel with the fixed fence part 51 facing the test vehicle 2 asshown in FIG. 1 (a) (c), so that the slide fence part 52 may bearbitrarily arranged in the range from the position closer to the rearend of the rear wheel 20R to the position closer to the front end of therear wheel 20R. This serves to flexibly adapt to test vehicles 2 variousin size, and further enhance the flexibility described above.

Furthermore, the first angled fence part 53 may be fixed in any positionfrom the position in parallel with the fixed fence part 51 to theposition at 270 degrees in the horizontal direction. The second angledfence part 54 may be fixed at any position from the position in parallelwith the slide fence part 52 to the position at 270 degrees in thehorizontal direction. This serves to allow the first angled fence part53 and the second angled fence part 54 to be arbitrarily positioned inthe safety fence 5.

The feature that the slide fence part 52 is guided in the longitudinaldirection of the test vehicle 2 by the slide rails 55 interposed betweenthe fixed fence part 51 and the slide fence part 52, serves to smooththe sliding operation of the slide fence part 52. In particular, thefeature that the slide fence part 52 is fixable to the fixed fence part51 by the third hand knob 514, serves to allow the slide fence part 52to be fixed to any position in a width direction of the safety fence 5in accordance with specifications of the test vehicle 2.

Moreover, the feature that the safety fence 5 is mainly made of analuminum frame and is relatively light and compact, serves to allow thesafety fence 5 to be more easily detached for maintenance thanconventional safety fences, and further easily carried by the handle516.

The safety fence 5 is not necessarily attached to the pit cover 4, butmay be attached to the roller cover of the roller 3. This also serves toproduce the effects described above, and prevent entry of a person intothe space between the test vehicle 2 and the safety fence 5.

Furthermore, the feature that the fixed fence support 513 is attachableto the pit cover 4 or the roller cover, serves to apply the safety fence5 to an existing vehicle testing device. In particular, by the fixingtool 6, it is possible to quickly and firmly attach the safety fence 5to the pit cover 4 or the roller cover.

Second Embodiment

FIG. 3 exemplarily shows a safety fence 5 according to a secondembodiment, which is produced by additionally providing the safety fence5 according to the first embodiment with a function of simply coveringthe roller opening 40.

<Example of Safety Fence 5>

The safety fence 5 according to the present embodiment is substantiallyidentical to the safety fence 5 according to the first embodiment exceptthat the fixed fence part 51 and the slide fence part 52 are capable ofcovering the roller opening 40, and the fixed fence part 51 is capableof being arranged horizontally.

Specifically, as shown in FIG. 6 (a) (b), the safety fence 5 includes afixed fence part 51, a slide fence part 52, a first angled fence part53, a second angled fence part 54, and a roller-side angling part 7.

The fixed fence part 51 and the slide fence part 52 are formed such thatthe dimension of the fixed fence part 51 and the slide fence part 52when arranged side by side is larger than the dimension of the rolleropening 40.

A welded wire netting 532 is mounted to a frame 531 of the first angledfence part 53, and the frame 531 is provided with a pedestal rubber 533for supporting the first angled fence part 53 on the pit cover 4,wherein the fixed fence part 51 is horizontally placed by the firstangled fence part 53.

A welded wire netting 542 is also mounted to a frame 541 of the secondangled fence part 54, and the frame 541 is provided with a pedestalrubber 543 for supporting the second angled fence part 54 on the pitcover 4, wherein the slide fence part 52 is horizontally placed by thesecond angled fence part 54.

The roller-side angling part 7 includes a support 71, a catch clip 72,and a hinge part 73. The support 71 is arranged on the fixed fencesupport 513 and structured to support the fixed fence part 51 upright.The catch clip 72 is structured to connect the support 71 and the fixedfence support 513 such that the fixed fence part 51 can be released fromthe upright state. The hinge part 73 is structured to connect thesupport 71 and the fixed fence support 513 and allow the fixed fencepart 51 to be upright or inclined toward the roller opening 40.

<Example of Use of Safety Fence 5>

The following describes an example of use of the safety fence 5according to the present embodiment with reference to FIGS. 3 and 6.

The safety fence 5 according to the present embodiment is normally usedas in the first embodiment.

When the test vehicle 2 is not placed on the pit cover 4 of the vehicletesting device, the roller opening 40 is covered by the safety fence 5.

Specifically, the connection between the fixed fence support 513 and thesupport 71 supporting the fixed fence part 51 is first released byoperating the catch clip 72 of the roller-side angling part 7. Thisallows the fixed fence part 51 to be inclined toward the roller opening40 by the hinge part 73 of the roller-side angling part 7.

Next, with the first angled fence part 53 and the second angled fencepart 54 fixed at 90 degrees from the fixed fence part 51 and the slidefences 52 toward the test vehicle 2, the fixed fence part 51 and theslide fence part 52 are inclined to the roller opening 40.

When the pedestal rubber 533 of the first angled fence part 53 andpedestal rubber 543 of the second angled fence part 54 come into contactwith the pit cover 4, the fixed fence part 51 and the slide fence part52 are supported by the pit cover 4 while being held substantiallyhorizontal by the first angled fence part 53 and the second angled fencepart 54. Thereby, the roller opening 40 is covered with the safety fence5.

<Effects of Present Embodiment>

As described above, with the safety fence 5 according to the presentembodiment, it is possible to easily cover the roller opening 40 of thepit cover 4 when the test vehicle 2 is not subjected to the test, inaddition to the effects of the first embodiment. Accordingly, the safetyfence 5 is in a state to prevent a person from directly contacting theroller opening 40, thereby preventing accidents such as an accident thata person falls into the roller opening 40, and an accident that a footof a person enters the space between the pit cover 4 and the roller 3.

In particular, the feature that the fixed fence part 51 is capable ofcovering the roller opening 40 and being arranged substantiallyhorizontally to correspond in position to the roller opening 40, servesto allow the roller opening 40 to be simply and reliably covered by thefixed fence part 51. Furthermore, the first angled fence part 53 and thesecond angled fence part 54 are capable of simply and firmly supportingthe fixed fence part 51 arranged substantially horizontally on the pitcover 4. This eliminates the necessity of preparing a separate cover forcovering the roller opening 40.

Third Embodiment

FIG. 7 exemplarily shows a safety fence 5 according to a thirdembodiment, which serves to prevent physical interference with a vehiclerestraining device 10 connected to a wheel hub of the wheel 20 of thetest vehicle 2 illustrated in FIG. 10.

<Example of Safety Fence 5>

The safety fence 5 according to this embodiment includes a fixed fencepart 81, a first slide fence part 82, a second slide fence part 83, athird slide fence part 84, a first angled fence part 85, and a secondangled fence part 86.

The fixed fence part 81 is arranged substantially in parallel with thewheel (the front wheel 20F, the rear wheel 20R) of the test vehicle 2that is mounted on the roller 3 exposed through the roller opening 40 ofthe pit cover 4.

The fixed fence part 81 includes: a rectangular frame 811 made of asteel material; a welded wire netting 812 mounted to the frame 811; andan L-shaped frame support part 813 structured to support the frame 811in a predetermined height position while being held upright on a support80 attached to the pit cover 4.

The first slide fence part 82 is arranged in parallel with the fixedfence part 81, and structured to move in the longitudinal direction ofthe test vehicle 2. The first slide fence part 82 includes: a frame 821substantially identical in shape to the frame 811; and a welded wirenetting 822 mounted to the frame 821.

Between the fixed fence part 81 and the first slide fence part 82, apair of slide rails 87 are further provided to guide the first slidefence part 82 in the longitudinal direction within a range of the widthof the first slide fence part 82 from the position where the first slidefence part 82 is located in parallel with the fixed fence part 81.

The second slide fence part 83 is structured to move in the verticaldirection of the test vehicle 2, and be arranged in parallel with thefixed fence part 81 and the first slide fence part 82. The second slidefence part 83 includes: a rectangular frame 831 made of a steelmaterial, similar to the frame 811; and a welded wire netting 832mounted to the frame 831.

Between the fixed fence part 81 and the second slide fence part 83, apair of slide rails 88 are further provided to guide the second slidefence part 83 in the vertical direction within a range of the verticallength of the second slide fence part 83 from the position where thesecond slide fence part 83 is located in parallel with the fixed fencepart 81.

The third slide fence part 84 is structured to move in the verticaldirection, and be arranged in parallel with the fixed fence part 81, thefirst slide fence part 82 and the second slide fence part 83. The thirdslide fence part 84 includes: a frame 841 substantially identical inshape to the frame 821 of the first slide fence part 82; and a weldedwire netting 842 mounted to the frame 841.

Between the first slide fence part 82 and the third slide fence part 84,a pair of slide rails 88 are further provided to guide the third slidefence part 84 in the vertical direction within a range of the verticallength of the third slide fence part 84 from the position where thethird slide fence part 84 is located in parallel with the first slidefence part 82.

The first angled fence part 85 is structured similarly to the firstangled fence part 53 according to the first embodiment, and is attachedto an end portion of the fixed fence part 81, and structured to swinginwardly and outwardly of the fixed fence part 81.

The second angled fence part 86 is structured similarly to the secondangled fence part 54 according to the first embodiment, and is attachedto an end portion of the first slide fence part 82, and structured toswing inwardly and outwardly of the first slide fence part 82.

<Example of Vehicle Restraining Device 10>

As shown in FIG. 10, the vehicle restraining device 10 includes: a hubconnecting part 11 attached to the wheel hub of the wheel 20 of the testvehicle 2; a wheel hub rod 12 connected rotatably to the hub connectingpart 11; and a fixing rod 13 connected rotatably close to an end portionof the wheel hub rod 12 closer to the hub connecting part 11.

As shown in FIG. 10, the wheel hub rod 12 and the fixing rod 13 are heldby a rod holder 14 that is mounted to an arbitrary position on a sliderail 42 of the vehicle testing device 1.

<Example of Use of Safety Fence 5>

The following describes an example of use of the safety fence 5according to the present embodiment with reference to FIGS. 7 and 10.

As shown in FIGS. 7 and 10, the safety fence 5 is arranged along aperipheral edge of the roller opening 40 by fixing the support 80 to thepit cover 4 by the clamp lever 65 not shown, similar to the support 50according to the first embodiment.

In particular, when the safety fence 5 is arranged substantially inparallel with the front wheel 20F of the test vehicle 2, the fixed fencepart 81 is located at a position closer to the front end of the frontwheel 20F of the test vehicle 2, as shown in FIG. 7A.

On the other hand, when the safety fence 5 is arranged substantially inparallel with the rear wheel 20R of the test vehicle 2, the fixed fencepart 81 is located at a position closer to the rear end of the rearwheel 20R.

Next, with regard to the safety fence 5 for the rear wheel 20R, thesecond slide fence part 83 and the third slide fence part 84 areoperated to slide upward toward the fixed fence part 81 and the firstslide fence part 82, respectively, while the first slide fence part 82is operated to slide toward the fixed fence part 81. Accordingly, thesafety fence 5 shifts from the state shown in FIG. 7 (b) to the stateshown in FIG. 7 (c), so that the first slide fence part 82, the secondslide fence part 83, and the third slide fence part 84 are arranged inparallel with the fixed fence part 81.

With regard to the safety fence 5 for the front wheel 20F, the firstslide fence part 82, the second slide fence part 83, and the third slidefence part 84 shown in FIG. 7 (a) are arranged in parallel with thefixed fence part 81 by similar operation.

Next, as shown in FIG. 10, the hub connecting part 11 of the vehiclerestraining device 10 is attached to the wheel hub of the wheel 20 ofthe test vehicle 2, and the wheel hub rod 12 is further attached to thehub connecting part 11. The fixing rod 13 is beforehand connected closeto the end portion of the wheel hub rod 12. Then, the wheel hub rod 12and the fixing rod 13 are held by the rod holder 14 that is mounted toan arbitrary position on the slide rail 42 of the vehicle testing device1.

<Effects of Present Embodiment>

As described above, the safety fence 5 according to the presentembodiment produces the following effects in addition to the effects ofthe first embodiment.

Specifically, when the vehicle door (the front door 21, the rear door22) of the test vehicle 2 is opened and closed, the first slide fencepart 82, the second slide fence part 83, and the third slide fence part84 can be operated individually to slide and move arbitrarily in thelongitudinal direction and the vertical direction of the test vehicle 2,thereby preventing interference with the vehicle door. This serves toexpand the range of opening and closing of the vehicle door of the testvehicle 2 provided to the vehicle testing device 1.

In particular, as described above, the present embodiment serves toensure an empty space at the lower side of the safety fence 5(particularly, below the fixed fence part 81) by sliding operation ofthe first slide fence part 82, the second slide fence part 83, and thethird slide fence part 84 into arrangement in parallel with the fixedfence part 81.

Therefore, even when a vehicle restraining device of a wheel hubconnection type like the vehicle restraining device 10 shown in FIG. 10is employed by the vehicle testing device 1, it is possible to preventphysical interference between the safety fence 5 and the wheel hub rod12 and the fixing rod 13 of the vehicle restraining device 10.Furthermore, it enhances the efficiency of workability when the wheelhub rods 12 of the vehicle restraining device 10 are attached to thewheel hubs of the front wheel 20F and the rear wheel 20R of the testvehicle 2.

The safety fence according to the present invention including the slidefence part is not limited to the third embodiment, but may be formedappropriately in accordance with various forms of vehicle testingdevices, vehicle restraining devices, and vehicle testing systems. Forexample, with regard to the embodiment shown in FIG. 7, the safety fence5 may be composed of the fixed fence part 81, the first slide fence part82, the second slide fence part 83, the first angled fence part 85, andthe second angled fence part 86, or may be composed of the fixed fencepart 81, the first slide fence part 82, the third slide fence part 84,the first angled fence part 85, and the second angled fence part 86.These embodiments also belong to the technical scope of the presentinvention.

Fourth Embodiment

FIG. 8 exemplarily shows a safety fence 5 according to a fourthembodiment, which serves to prevent physical interference with thevehicle restraining device 10 connected to the wheel hub of the wheel 20of the test vehicle 2 illustrated in FIG. 10.

<Examples of Safety Fence 5>

As shown in FIGS. 8 and 10, the safety fence 5 is attached to the pitcover 4 along a peripheral edge of one of the roller openings 40corresponding to each wheel 20 of the test vehicle 2 shown in FIG. 10.

<First Example of Safety Fence 5>

As shown in FIG. 8, the safety fence 5 according to the first exampleincludes a fixed fence part 91, a first foldable fence part 92, a secondfoldable fence part 93, and a first angled fence part 96, and a secondangled fence part 97.

The fixed fence part 91 is disposed substantially in parallel with thewheel (the front wheel 20F, the rear wheel 20R) of the test vehicle 2mounted on the roller 3 exposed through the roller opening 40 of the pitcover 4. The fixed fence part 91 is supported upright by the support 90attached to the pit cover 4.

As shown in FIG. 8 (b), the first foldable fence part 92 is attached toan end portion of the fixed fence part 91, and structured to swingoutwardly of the fixed fence part 91.

The second foldable fence part 93 is attached to an end portion of thefirst foldable fence part 92, and structured to swing outwardly of thefirst foldable fence part 92.

The first angled fence part 96 is attached to an end portion of thefixed fence part 91, and structured to swing inwardly and outwardly ofthe fixed fence part 91.

The second angled fence part 97 is attached to an end portion of thesecond foldable fence part 93, and structured to swing inwardly andoutwardly of the second foldable fence part 93.

<Second Example of Safety Fence 5>

As shown in FIG. 9, the safety fence 5 according to the second exampleincludes a fixed fence part 91, a first foldable fence part 92, a secondfoldable fence part 93, and a third foldable fence part 94, a fourthfoldable fence part 95, a first angled fence part 96, a second angledfence part 97, a first support member 98, and a second support member99.

<Example of Fixed Fence Part 91>

The fixed fence part 91 is disposed substantially in parallel with thewheel 20 of the test vehicle 2 mounted on the roller 3 exposed throughthe roller opening 40 of the pit cover 4.

As shown in FIGS. 9 (a) (f), the fixed fence part 91 includes: asubstantially rectangular frame 911 made of a steel material; a weldedwire netting 912 mounted to the frame 911; and an L-shaped frame supportpart 913 structured to support the frame 911 in a predetermined heightposition while being held upright on a support 90 attached to the pitcover 4.

Furthermore, the fixed fence part 91 is provided with a handle 914 forcarrying the safety fence 5, and a first angle adjustment plate 97 a fordefining a range of rotation of the first angled fence part 96.

As shown in FIG. 9 (b), the first angle adjustment plate 97 a is formedwith a slot 971 a through which a rotation shaft of a first hand knob 98a is inserted for fixing the first angled fence part 96 to the firstangle adjustment plate 97 a. The slot 971 a is arc-shaped and defines arange of rotation of the first angled fence part 96 from a position inparallel with the fixed fence part 91 to a position at 270 degrees in ahorizontal direction.

<Example of First Foldable Fence Part 92>

The first foldable fence part 92 is attached to an end portion of thefixed fence part 91, and structured to swing outwardly of the fixedfence part 91.

The first foldable fence part 92 includes: a rectangular frame 921longer and narrower than the frame 911 of the fixed fence part 91; and awelded wire netting 922 mounted to the frame 921.

The frame 921 is connected to the frame support 913 of the fixed fencepart 91 via a hinge part 60, and structured to swing outwardly of thefixed fence part 91.

<Example of Second Foldable Fence Part 93>

The second foldable fence part 93 is attached to an end portion of thefirst foldable fence part 92, and structured to swing outwardly of thefirst foldable fence part 92.

The second foldable fence part 93 includes: a frame 931 identical inspecifications to the frame 911; a welded wire netting 932 identical inspecifications to the welded wire netting 912; a frame support part 933structured to support the frame 931 in a predetermined height position(identical in height to the frame 911) while being held upright by thesupport 90.

The frame support part 933 is structured to have the same specificationsas the frame support portion 913, and connected to an end portion of theframe 921 of the first foldable fence part 92 via a hinge part 60, andstructured to swing outwardly of the first foldable fence part 92.

Furthermore, the second foldable fence part 93 is provided with a handle934 for carrying the safety fence 5, and a second angle adjustment plate97 b for defining a range of rotation of the second angled fence part97.

As shown in FIG. 9 (b), the second angle adjustment plate 97 b is formedwith a slot 971 b through which a rotation shaft of a second hand knob98 b is inserted for fixing the second angled fence part 97 to thesecond angle adjustment plate 97 b. The slot 971 b is arc-shaped anddefines a range of rotation of the second angled fence part 97 from aposition in parallel with the second foldable fence part 93 to aposition at 270 degrees in the horizontal direction.

<Example of Third Foldable Fence Part 94>

The third foldable fence part 94 is attached to a lower end portion ofthe fixed fence part 91, and structured to be arranged in parallel withthe fixed fence part 91.

The third foldable fence part 94 includes: a substantially square frame941 structured to be arranged between the frame 911 of the fixed fencepart 91 and the frame support 913; and a welded wire netting 942 mountedto the frame 941.

The frame 941 is formed to be substantially identical in shape to theframe 911 of the fixed fence part 91, and is connected to the frame 911of the fixed fence part 91 via a hinge part 60, and structured to swingoutwardly of the fixed fence part 91.

<Example of Fourth Foldable Fence Part 95>

The fourth foldable fence part 95 is attached to a lower end portion ofthe second foldable fence part 93, and structured to be arranged inparallel with the second foldable fence part 93.

The fourth foldable fence part 95 includes: a substantially square frame951 structured to be arranged between the frame 931 of the secondfoldable fence part 93 and the frame support 933, and a welded wirenetting 952 mounted to the frame 951.

The frame 951 is connected to the frame 931 via the hinge part 60, andstructured to swing in the vertical direction, and be arranged inparallel with the frame 931 of the second foldable fence part 93.

<Example of First Angled Fence Part 96>

The first angled fence part 96 is attached to an end portion of thefixed fence part 91, and structured to swing inwardly and outwardly ofthe fixed fence part 91.

The first angled fence part 96 includes: a rectangular frame 961 shorterand narrower than the frame 911 of the fixed fence part 91; a weldedwire netting 962 having the same specifications as the fixed fence part91; and a connecting member 963 extending along a long side of the frame961.

The connecting member 963 is connected to an end portion of the frame911 via a hinge part 60. Furthermore, the connecting member 963 includesan upper end portion structured such that a first hand knob 98 a isscrewed via a first angle adjustment plate 97 a to the upper endportion.

<Example of Second Angled Fence Part 97>

The second angled fence part 97 is attached to an end portion of thesecond foldable fence part 93, and structured to swing inwardly andoutwardly of the second foldable fence part 93.

The second angled fence part 97 includes: a rectangular frame 971shorter and narrower than the frame 931 of the second foldable fencepart 93; a welded wire netting 972 having the same specifications as thefixed fence part 91; and a connecting member 973 extending along a longside of the frame 971.

The connecting member 973 is connected to an end portion of the frame931 via a hinge part 60. Furthermore, the connecting member 973 includesan upper end portion structured such that a second hand knob 98 b isscrewed via a second angle adjustment plate 97 b to the upper endportion.

As shown in FIG. 9 (b), the first angle adjustment plate 97 a or thesecond angle adjustment plate 97 b is provided with a connecting member101 structured to connect the first angle adjustment plate 97 a and thesecond angle adjustment plate 97 b so as to place the second foldablefence part 93 and the fixed fence part 91 in parallel with each other.

<Example of First Support Member 98>

At a side face of the support 90, the first support member 98additionally supports the fixed fence part 91 on the support 90substantially in parallel as described above.

As shown in FIG. 9 (a), the first support member 98 is made of asubstantially L-shaped plate steel material (for example, stainlesssteel), and attached to side surfaces of the support 90 and the framesupport portion 913 in the same plane.

<Example of Second Support Member 99>

The second support member 99 is disposed at an upper face of the support90, and structured to support the first foldable fence part 92, thesecond foldable fence part 93, and the fourth foldable fence part 95 inseries with the fixed fence part 91.

As shown in FIG. 9 (a), the second support member 99 is made of steel(stainless steel) to have a rectangular plate shape, and is structuredto move in the vertical direction on the side faces of the support 90and the frame support part 933 in the same plane.

For example, when the first foldable fence part 92, the second foldablefence part 93, and the fourth foldable fence part 95 are arranged inseries with the fixed fence part 91, the second support member 99 isfixed to the side surfaces of the frame 921 of the support 90 and theframe support part 933 by a fixing tool 991 such as a bolt.

On the other hand, when the first foldable fence part 92, the secondfoldable fence part 93, and the fourth foldable fence part 95 are foldedoutside the fixed fence part 91, the second support member 99 is fixedto the side face of the support 90 by the fixing tool 991 below theframe 921 and the frame support part 933.

<Example of Vehicle Restraining Device 10>

As shown in FIG. 10, the vehicle restraining device 10 includes: a hubconnecting part 11 attached to the wheel hub of the wheel 20 of the testvehicle 2; a wheel hub rod 12 connected rotatably to the hub connectingpart 11; and a fixing rod 13 connected rotatably close to an end portionof the wheel hub rod 12 closer to the hub connecting part 11.

As shown in FIG. 10, the wheel hub rod 12 and the fixing rod 13 are heldby a rod holder 14 that is mounted to an arbitrary position on a sliderail 42 of the vehicle testing device 1.

<Example of Use of Safety Fence 5>

The following describes an example of use of the safety fence 5according to the present embodiment with reference to FIGS. 8 and 10, inparticular, an example of use of the safety fence 5 according to thesecond example shown in FIG. 9.

As shown in FIG. 8, the test vehicle 2 is placed on the pit 41. When thewheel 20 of the test vehicle 2 is placed on the roller 3, the safetyfence 5 may be attached to or removed from the pit cover 4. When thesafety fence 5 is attached, the support 90 of the safety fence 5 isfixed at a predetermined position on the pit cover 4 as shown in FIG. 9(a), so that the safety fence 5 is arranged and fixed along a peripheraledge of the roller opening 40 of the pit cover 4 shown in FIGS. 8 and10.

In particular, when the safety fence 5 is arranged substantially inparallel with the front wheel 20F of the test vehicle 2, the fixed fencepart 91 is located at a position closer to the front end of the frontwheel 20F of the test vehicle 2.

On the other hand, when the safety fence 5 is arranged substantially inparallel with the rear wheel 20R of the test vehicle 2, the fixed fencepart 91 is located at a position closer to the rear end of the rearwheel 20R.

Next, with regard to the safety fence 5 for the rear wheel 20R, thethird foldable fence part 94 is folded upward and arranged in parallelwith the fixed fence part 91. Similarly, the fourth foldable fence part95 is folded upward and arranged in parallel with the second foldablefence part 93.

When the first foldable fence part 92 and the second foldable fence part93 are folded outside the fixed fence part 91, the second support member99 shown in FIG. 9 (a) is fixed to the side face of the support 90 bythe fixing tool 991 below the frame 921 and the frame support part 933.This allows the first foldable fence part 92 and the second foldablefence part 93 to be folded outside the fixed fence part 91.

Then, as shown in FIG. 9 (d), after the first foldable fence part 92 isrotated to the outside of the fixed fence part 91, the first angleadjustment plate 97 a closer to the fixed fence part 91 and the secondangle adjustment plate 97 b closer to the second foldable fence part 93are connected to each other by the connecting member 101. Under thiscondition, as shown in FIG. 9 (d), the fixed fence part 91 and thesecond foldable fence part 93 are arranged in parallel with each othervia the first foldable fence part 92.

Also, with regard to the safety fence 5 for the front wheel 20F, bysimilar operation, under a condition that the first foldable fence part92 and the second foldable fence part 93 are folded, the fixed fencepart 91 and the second foldable fence part 93 are arranged in parallelwith each other via the first foldable fence part 92.

The foregoing operation of the safety fence 5 allows the vehiclerestraining device 10 to be connected to the wheel hub of the wheel 20of the test vehicle 2. The following describes an example of connectingoperation of the vehicle restraining device 10.

As shown in FIG. 9, the hub connecting part 11 of the vehiclerestraining device 10 is attached to the wheel hub of the wheel 20 ofthe test vehicle 2, and the wheel hub rod 12 is connected to the hubconnecting part 11. The fixing rod 13 is beforehand connected close toan end of the wheel hub rod 12. Then, the wheel hub rod 12 and thefixing rod 13 are held by the rod holder 14 placed at an arbitraryposition on the slide rail 42 of the vehicle testing device 1.

Thereafter, when the connection between the first angle adjustment plate97 a and the second angle adjustment plate 97 b by the connecting member101 is released, the second foldable fence part 93 and the fourthfoldable fence part 95 are arranged in series with the fixed fence part91, as shown in FIG. 9 (a). Under this condition, the second supportmember 99 is fixed to the side faces of the support 90, the frame 921,and the frame support 933 by the fixing tool 991. This allows the firstfoldable fence part 92, the second foldable fence part 93, and thefourth foldable fence part 95 to be stably supported in series with thefixed fence part 91.

The safety fence 5 according to the first example is also attached tothe pit cover 4 of the vehicle testing device 1 by the same process asthe safety fence 5 according to the second example.

<Effects of Present Embodiment>

With the safety fence 5 according to the first or second example, whenthe front door 21 or the rear door 22 of the test vehicle 2 is openedand closed, it is possible to prevent interference between the safetyfence 5 and the front door 21 or rear door 22 by operation of the firstfoldable fence part 92, the second foldable fence part 93, the thirdfoldable fence part 94, the fourth foldable fence part 95, the firstangled fence part 96, and the second angled fence part 97. Inparticular, it is possible to move the center of the safety fence 5 fromthe wheel base of the test vehicle 2 to the outside of the test vehicle2, and thereby expand the range of opening and closing of the front door21 or rear door 22 of the test vehicle 2 prepared for the vehicletesting device 1.

Furthermore, with regard to the safety fence 5 for the front wheel 20F,the fixed fence part 91 is arranged at a position closer to the frontend of the front wheel 20F of the test vehicle 2, substantially inparallel with the front wheel 20F. With regard to the safety fence 5 forthe rear wheel 20R, the fixed fence part 91 is arranged at a positioncloser to the rear of the rear wheel 20R of the test vehicle 2,substantially in parallel with the rear wheel 20R. In addition, thefirst foldable fence part 92, the second foldable fence part 93, thethird foldable fence 94, and the fourth foldable fence part 95 can berotated and folded to the outside of the fixed fence part 91. Thisserves to flexibly adapt to test vehicles 2 various in size, and furtherenhance the flexibility described above.

Furthermore, if the safety fence 5 is composed of steel materials suchas aluminum frames, the safety fence 5 can be made relatively light andcompact. This serves to allow the safety fence 5 to be more easilydetached for maintenance than conventional safety fences, and furthereasily carried by the handles 914, 934.

Furthermore, the feature of the safety fence 5 that the first foldablefence part 92, the second foldable fence part 93, the third foldablefence 94, and the fourth foldable fence part 95 are structured to befolded and arranged in parallel with the fixed fence part 91, serves toensure an empty space at the lower side of the safety fence 5,particularly, below the fixed fence part 91.

Therefore, even when a vehicle restraining device of a wheel hubconnection type like the vehicle restraining device 10 shown in FIG. 10is employed by the vehicle testing device 1, it is possible to preventphysical interference between the safety fence 5 and the wheel hub rod12 and the fixing rod 13 of the vehicle restraining device 10.Furthermore, it enhances the efficiency of workability when the wheelhub rods 12 of the vehicle restraining device 10 are attached to thewheel hubs of the front wheel 20F and the rear wheel 20R of the testvehicle 2.

The safety fence 5 may not be necessarily attached to the pit cover 4but may be attached to the roller cover of the roller 3. This alsoserves to produce the effects described above, and prevent entry of aperson into a space between the test vehicle 2 and the safety fence 5.

Furthermore, the feature that the frame support portion 913 can beattached to the pit cover 4 or the roller cover, serves to allow thesafety fence 5 to be applied to an existing vehicle testing device. Inparticular, the safety fence 5 can be quickly and firmly attached to thepit cover 4 or the roller cover by the fixing tool 6.

The present invention is not limited to the fourth embodiment, but maybe implemented in various forms within the scope of the claims of thepresent invention. Specifically, the safety fence according to thepresent invention is not limited to the first and second examples, butmay be formed appropriately in accordance with various vehicle testingdevices, vehicle restraining devices, and vehicle test systems. Forexample, with regard to the configuration of FIG. 9, the safety fence 5may be composed of the fixed fence part 91, the first foldable fencepart 92, the second foldable fence part 93, and the fourth foldablefence part 95, or may be composed of the fixed fence part 91, the firstfoldable fence part 92, the second foldable fence part 93, the thirdfoldable fence part 94. These embodiments also belong to the technicalscope of the present invention.

The invention claimed is:
 1. A safety fence for a vehicle testingdevice, comprising: a fixed fence part structured to be arrangedsubstantially in parallel with a wheel of a test vehicle, wherein thetest vehicle is placed on a roller exposed through a roller opening of apit cover; a slide fence part arranged in parallel with the fixed fencepart, and structured to move in a longitudinal direction of the testvehicle; a first angled fence part attached to an end portion of thefixed fence part, and structured to swing inwardly and outwardly of thefixed fence part; and a second angled fence part attached to an endportion of the slide fence part, and structured to swing inwardly andoutwardly of the slide fence part.
 2. The safety fence as claimed inclaim 1, comprising a part structured to be attached to the pit cover ora roller cover, wherein the safety fence extends along a peripheral edgeof the roller opening.
 3. The safety fence as claimed in claim 2,comprising: a fixed fence part support structured to support the fixedfence part; and a fixing tool structured to fix the fixed fence partsupport to the pit cover or the roller cover.
 4. The safety fence asclaimed in claim 1, wherein the fixed fence part is structured to bearranged substantially horizontally so as to correspond in position tothe roller opening, and cover the roller opening.
 5. The safety fence asclaimed in claim 4, wherein the first angled fence part and the secondangled fence part are structured to allow the fixed fence part to besupported by the pit cover when the fixed fence part is arrangedsubstantially horizontally.
 6. The safety fence as claimed in claim 1,wherein: the first angled fence part is structured to be fixed at afirst arbitrary position in a range of 270 degrees from a positionparallel with the fixed fence part; and the second angled fence part isstructured to be fixed at a second arbitrary position in a range of 270degrees from a position parallel with the slide fence part.
 7. Thesafety fence as claimed in claim 6, further comprising: a first handknob structured to fix the first angled fence part to the firstarbitrary position; and a second hand knob structured to fix the secondangled fence part to the second arbitrary position.
 8. The safety fenceas claimed in claim 1, further comprising a pair of slide rails disposedbetween the fixed fence part and the slide fence part, and structured toguide the slide fence part in the longitudinal direction.
 9. The safetyfence as claimed in claim 8, further comprising a third hand knobstructured to fix the slide fence part to the fixed fence part.
 10. Avehicle testing device comprising the safety fence as claimed inclaim
 1. 11. A safety fence for a vehicle testing device, comprising: afixed fence part structured to be arranged substantially in parallelwith a wheel of a test vehicle, wherein the test vehicle is placed on aroller exposed through a roller opening of a pit cover; a first slidefence part arranged in parallel with the fixed fence part, andstructured to move in a longitudinal direction of the test vehicle; asecond slide fence part structured to be arranged in parallel with thefixed fence part, and move in a vertical direction of the test vehicle;a first angled fence part attached to an end portion of the fixed fencepart, and structured to swing inwardly and outwardly of the fixed fencepart; and a second angled fence part attached to an end portion of thefirst slide fence part, and structured to swing inwardly and outwardlyof the first slide fence part.
 12. A vehicle testing device comprisingthe safety fence as claimed in claim
 11. 13. A safety fence for avehicle testing device, comprising: a fixed fence part structured to bearranged substantially in parallel with a wheel of a test vehicle,wherein the test vehicle is placed on a roller exposed through a rolleropening of a pit cover; a first slide fence part arranged in parallelwith the fixed fence part, and structured to move in a longitudinaldirection of the test vehicle; a third slide fence part structured to bearranged in parallel with the first slide fence part, and move in avertical direction of the test vehicle; a first angled fence partattached to an end portion of the fixed fence part, and structured toswing inwardly and outwardly of the fixed fence part; and a secondangled fence part attached to an end portion of the first slide fencepart, and structured to swing inwardly and outwardly of the first slidefence part.
 14. A vehicle testing device comprising the safety fence asclaimed in claim
 13. 15. A safety fence for a vehicle testing device,comprising: a fixed fence part structured to be arranged substantiallyin parallel with a wheel of a test vehicle, wherein the test vehicle isplaced on a roller exposed through a roller opening of a pit cover; afirst slide fence part arranged in parallel with the fixed fence part,and structured to move in a longitudinal direction of the test vehicle;a second slide fence part structured to be arranged in parallel with thefixed fence part, and move in a vertical direction of the test vehicle;a third slide fence part structured to be arranged in parallel with thefirst slide fence part, and move in the vertical direction; a firstangled fence part attached to an end portion of the fixed fence part,and structured to swing inwardly and outwardly of the fixed fence part;and a second angled fence part attached to an end portion of the firstslide fence part, and structured to swing inwardly and outwardly of thefirst slide fence part.
 16. A vehicle testing device comprising thesafety fence as claimed in claim 15.